﻿/*
 * Copyright (c) 2015-2016 Constantijn Evenhuis (blueprints@const.nl)
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
using Blueprints.Resolution;
using System;

namespace Blueprints.Defaults.Converters
{
    internal sealed class DelegateValueDescriptor<ValueType> : IValueDescriptor
    {
        public DelegateValueDescriptor(Func<ValueType, string> convertToString, Func<string, ValueType> convertFromString, Func<string, bool> canConvertFromString)
        {
            ConvertToStringMethod = convertToString;
            ConvertFromStringMethod = convertFromString;
            CanConvertFromStringMethod = canConvertFromString;
        }

        public DelegateValueDescriptor(Func<ValueType, string> convertToString, Func<string, ValueType> convertFromString, bool determineConvertabilityByConverting)
        {
            ConvertToStringMethod = convertToString;
            ConvertFromStringMethod = convertFromString;
            if (determineConvertabilityByConverting)
            {
                CanConvertFromStringMethod = (s) =>
                {
                    try
                    {
                        ConvertFromString(s);
                        return true;
                    }
                    catch
                    {
                        return false;
                    }
                };
            }
            else
            {
                CanConvertFromStringMethod = (s) => { return true; };
            }
        }

        public DelegateValueDescriptor(Func<ValueType, string> convertToString, Func<string, ValueType> convertFromString)
            : this(convertToString, convertFromString, (s) => { return true; })
        {
        }

        public Type Type
        {
            get
            {
                return typeof(ValueType);
            }
        }

        public Func<ValueType, string> ConvertToStringMethod
        {
            get;
            private set;
        }

        public Func<string, ValueType> ConvertFromStringMethod
        {
            get;
            private set;
        }

        public Func<string, bool> CanConvertFromStringMethod
        {
            get;
            private set;
        }

        public string ConvertToString(object instance)
        {
            return ConvertToStringMethod.Invoke((ValueType)instance);
        }

        public object ConvertFromString(string value)
        {
            return ConvertFromStringMethod.Invoke(value);
        }

        public bool CanConvertFromString(string value)
        {
            return CanConvertFromStringMethod.Invoke(value);
        }
    }
}